William Hunt "Bill" Gross (born April 13, 1944) is an American financial manager and author. He co-founded Pacific Investment Management (PIMCO). Gross also ran PIMCO's $270.0 billion Total Return Fund (PTTRX). Gross left Pimco to join Janus on September 26, 2014.

In 2012, Gross and his wife, Sue, donated $20 million to Cedars-Sinai (Los Angeles) for the new Sue and Bill Gross Surgery and Procedure Center. The center will take up the fifth floor of the Pavilion, which is scheduled to open in summer 2013.[citation needed]

In 2013, Gross and his wife donated $20 million to Mercy Ships. This will be designated to build toward a new hospital ship, currently in the design phase, to join the current hospital ship, the Africa Mercy, in delivering medical services to the poor. In honor of this donation, the hospital on board the new ship will be named the Sue and Bill Gross Healing Hospital.[17]